Evidence for Gamma-Ray Pulsations from the Classical Nova ASASSN-16ma

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Abstract

I report here a new result extracted from the Fermi Large Area Telescope observation of the classical nova ASASSN-16ma that exhibits coherent ?-ray pulsations at 544.84(7) s during its outburst in 2016. Considering the number of independent trials, the significance of the evidence is 4.0s, equivalent to a false-alarm probability of 5.9 10-5. The periodicity was steady during the 4 days of its appearance, indicating its origin as the spinning signal of the white dwarf. Given that the optical and ?-ray light curves of some shock-powered ?-ray novae have been recently shown to be closely correlated to each other, the ?-ray pulsation phenomenon likely implies an existence of associated optical pulsations, which would provide detailed ephemerides for these extreme white dwarf binaries for further investigations in the near future.

Original languageEnglish
Article numberL17
JournalAstrophysical Journal Letters
Volume924
Issue number1
DOIs
Publication statusPublished - 2022 Jan 1

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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